Effects of Plant Spacing and Mulching on Yield and Profitability of Lettuce (Lactuca sativa L.). Journal of Agriculture & Rural Development, [S. l.], v. 4, n. 1, p. 107–111, 2008. DOI: 10.3329/jard.v4i1.776. Disponível em: https://banglajol.info/index.php/JARD/article/view/776. Acesso em: 25 jun. 2026.